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608fd3fd | 1 | /** @file\r |
2 | CompareMem() implementation.\r | |
3 | \r | |
4 | Copyright (c) 2006, Intel Corporation<BR>\r | |
5 | All rights reserved. This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | Module Name: CompareMemWrapper.c\r | |
14 | \r | |
15 | The following BaseMemoryLib instances share the same version of this file:\r | |
16 | \r | |
17 | BaseMemoryLib\r | |
18 | BaseMemoryLibMmx\r | |
19 | BaseMemoryLibSse2\r | |
20 | BaseMemoryLibRepStr\r | |
21 | PeiMemoryLib\r | |
add13dc2 | 22 | DxeMemoryLib\r |
608fd3fd | 23 | \r |
24 | **/\r | |
25 | \r | |
24de7645 | 26 | #include "MemLibInternals.h"\r |
608fd3fd | 27 | \r |
28 | /**\r | |
4ba61e5e | 29 | Compares the contents of two buffers.\r |
608fd3fd | 30 | \r |
4ba61e5e | 31 | This function compares Length bytes of SourceBuffer to Length bytes of DestinationBuffer.\r |
32 | If all Length bytes of the two buffers are identical, then 0 is returned. Otherwise, the\r | |
33 | value returned is the first mismatched byte in SourceBuffer subtracted from the first\r | |
34 | mismatched byte in DestinationBuffer.\r | |
35 | If Length > 0 and DestinationBuffer is NULL and Length > 0, then ASSERT().\r | |
36 | If Length > 0 and SourceBuffer is NULL and Length > 0, then ASSERT().\r | |
37 | If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). \r | |
38 | If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). \r | |
608fd3fd | 39 | \r |
608fd3fd | 40 | \r |
4ba61e5e | 41 | @param DestinationBuffer Pointer to the destination buffer to compare.\r |
42 | @param SourceBuffer Pointer to the source buffer to compare.\r | |
43 | @param Length Number of bytes to compare.\r | |
608fd3fd | 44 | \r |
4ba61e5e | 45 | @return 0 All Length bytes of the two buffers are identical.\r |
46 | @retval Non-zero The first mismatched byte in SourceBuffer subtracted from the first\r | |
47 | mismatched byte in DestinationBuffer.\r | |
608fd3fd | 48 | \r |
49 | **/\r | |
50 | INTN\r | |
51 | EFIAPI\r | |
52 | CompareMem (\r | |
24e25d11 | 53 | IN CONST VOID *DestinationBuffer,\r |
54 | IN CONST VOID *SourceBuffer,\r | |
55 | IN UINTN Length\r | |
608fd3fd | 56 | )\r |
57 | {\r | |
608fd3fd | 58 | if (Length == 0) {\r |
59 | return 0;\r | |
60 | }\r | |
4ba61e5e | 61 | ASSERT (DestinationBuffer != NULL);\r |
62 | ASSERT (SourceBuffer != NULL);\r | |
63 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)DestinationBuffer));\r | |
64 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)SourceBuffer));\r | |
65 | \r | |
608fd3fd | 66 | return InternalMemCompareMem (DestinationBuffer, SourceBuffer, Length);\r |
67 | }\r |